Premium
Rheology of carboxymethylcellulose made from bacterial cellulose
Author(s) -
Cheng H. N.,
Takai Mitsuo,
Ekong Ekong A.
Publication year - 1999
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19991400116
Subject(s) - thixotropy , carboxymethyl cellulose , shear thinning , rheology , bacterial cellulose , cellulose , materials science , chemical engineering , apparent viscosity , viscosity , polymer , newtonian fluid , polymer chemistry , chemistry , composite material , thermodynamics , sodium , engineering , metallurgy , physics
Partly as a result of the high solution viscosity of bacterial cellulose, carboxymethylcellulose (CMC) derived from this material exhibits shear‐thinning and thixotropic properties. With suitable sample treatment, the CMC solution shows gel‐like rheology suggesting the presence of a three‐dimensional network. This behavior is consistent with heterogeneous substitution of the carboxymethyl functionality on the polymer chains. For comparison, bacterial cellulose is also degraded by either acid or ultrasound to reduce its molecular weight and converted to CMC. The flow behavior of the resulting CMC solutions is nearly Newtonian with slight shear thinning but no thixotropy, suggesting that the carboxymethylation reaction is almost random.